Expires:202504181900;Remove:202504181900;550049 WWUS45 KCYS 181746 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 1146 AM MDT Fri Apr 18 2025 NEZ002-095-181900- /O.EXP.KCYS.WW.Y.0027.000000T0000Z-250418T1800Z/ Dawes County-Northern Sioux County- Including the cities of Chadron St Park, Chadron, and Harrison 1146 AM MDT Fri Apr 18 2025 ...WINTER WEATHER ADVISORY WILL EXPIRE AT NOON MDT TODAY... Snow has ended. Use caution as slick roads will be possible for the next few hours. $$